Rescue of Obesity-Induced Infertility in Female Mice due to a Pituitary-Specific Knockout of the Insulin Receptor

Obesity is associated with insulin resistance in metabolic tissues such as adipose, liver, and muscle, but it is unclear whether nonclassical target tissues, such as those of the reproductive axis, are also insulin resistant. To determine if the reproductive axis maintains insulin sensitivity in obe...

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Bibliographic Details
Published in:	Cell metabolism Vol. 12; no. 3; pp. 295 - 305
Main Authors:	Brothers, Kathryn J., Wu, Sheng, DiVall, Sara A., Messmer, Marcus R., Kahn, C. Ronald, Miller, Ryan S., Radovick, Sally, Wondisford, Fredric E., Wolfe, Andrew
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 08-09-2010
Subjects:	Animals Diet Estrous Cycle - physiology Female Gonadotropin-Releasing Hormone - metabolism HUMDISEASE Infertility, Female - etiology Infertility, Female - genetics Insulin - metabolism Insulin Resistance - physiology Luteinizing Hormone - metabolism Male Mice Mice, Knockout Obesity - complications Pituitary Gland - metabolism Pituitary Gland - physiology Receptor, Insulin - genetics Receptor, Insulin - metabolism Reproduction - physiology Signal Transduction - physiology HUMDISEASE
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Summary:	Obesity is associated with insulin resistance in metabolic tissues such as adipose, liver, and muscle, but it is unclear whether nonclassical target tissues, such as those of the reproductive axis, are also insulin resistant. To determine if the reproductive axis maintains insulin sensitivity in obesity in vivo, murine models of diet-induced obesity (DIO) with and without intact insulin signaling in pituitary gonadotrophs were created. Diet-induced obese wild-type female mice (WT DIO) were infertile and experienced a robust increase in luteinizing hormone (LH) after gonadotropin-releasing hormone (GnRH) or insulin stimulation. By contrast, both lean and obese mice with a pituitary-specific knockout of the insulin receptor (PitIRKO) exhibited reproductive competency, indicating that insulin signaling in the pituitary is required for the reproductive impairment seen in DIO and that the gonadotroph maintains insulin sensitivity in a setting of peripheral insulin resistance. [Display omitted] ► Mixed-background female mice become infertile due to diet-induced obesity (DIO) ► WT DIO mice have elevated LH, disrupted estrous cycles, and high sensitivity to GnRH ► Disruption of IR in the pituitary normalizes reproductive function in female DIO mice ► Pituitary insulin sensitivity is maintained in DIO mice
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work
ISSN:	1550-4131 1932-7420
DOI:	10.1016/j.cmet.2010.06.010